GMP results for Woodcrest, Conroe, anyone?

Does anyone on this list have an Intel Woodcrest or Conroe,
aka "Core
2" that runs some sensible 64-bit operating system?

It would be interesting to know how well it performs with
GMP.  While
the new P6 incarnation clearly has great 32-bit performance,
for GMP
we almost only care about its 64-bit multiply throughput.

-- 
Torbjörn
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On 2006-07-28 13:21:29 +0200, Torbjorn Granlund wrote:

> It would be interesting to know how well it performs
with GMP. While
> the new P6 incarnation clearly has great 32-bit
performance, for GMP
> we almost only care about its 64-bit multiply
throughput.

Unless the 64-bit multiply throughput is more than 4 times
as low as
the 32-bit multiply throughput. But they wouldn't do that,
would they?


-- 
Karl Hasselström, khatreskal.com
      www.treskal.com/kalle
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Karl Hasselström <khatreskal.com> writes:

  On 2006-07-28 13:21:29 +0200, Torbjorn Granlund wrote:
  
  > It would be interesting to know how well it performs
with GMP. While
  > the new P6 incarnation clearly has great 32-bit
performance, for GMP
  > we almost only care about its 64-bit multiply
throughput.
  
  Unless the 64-bit multiply throughput is more than 4 times
as low as
  the 32-bit multiply throughput. But they wouldn't do
that, would they?
  
  
Well, they've already done that...

The Prescott P4 (and later) can sustain one 32x32->64
multiply
every 2nd cycle, and one 64x64->128 multiply every 10th
cycle.

If Net rumours are to be believed, there are issues with
64-bit
arithmetic performance also with the new P6.

-- 
Torbjörn
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